• 作者： Chen, Yin-Zu; Wu, Jong-Shiun
• 中文摘要： 本研究以硼氫化鈉或硼乙烷為還原劑將醋酸鈷還原,並以鉻為促進劑,製備各種型式的硼化鈷觸媒。以ICP、XRD、XPS分析,及氫與一氧化碳之化學吸附鑑定分析觸媒表面特性,並以一氧化碳氫化反應探討觸媒之催化性質。所有硼化鈷觸媒皆為鐵磁性及無定型結構,觸媒經加熱後會有一些晶體呈現。硼在觸媒中以兩種型式存在,一為氧化硼,另一為金屬硼(Co-B),後者的硼有供應電子的效應。氫並非完全以解離吸附之型式存在觸媒表面,一部分吸收入觸媒本體。鉻在硼化鈷觸媒中能促進CO的吸附,CO的解離及CO的氫化活性。
• 英文摘要： Unpromoted and Cr-promoted cobalt borides were prepared by chemical reduction of cobalt acetate with sodium borohydride or diborane. The physical and chemical properties were characterized by ICP, XRD and XPS analyses, and chemisorption of hydrogen and carbon monoxide. The catalytic properties of these catalysts were investigated on CO hydrogenation at 250-280.degree.C, 1atm and a H/sub 2//CO ratio of 3. Cobalt borides prepared from cobalt acetate were all ferromagnetic. Fresh cobalt borides were amorphous, but some crystallines were formed after heating. There were two boron states in the catalysts, one being the boron oxide state and the other the boride state. Not all hydrogen was dissociatively adsorbed on the cobalt borides, some being absorbed into the matrix of catalysts. The dopant of chromium promoted the chemisorption and dissociation of carbon monoxide. Chromium also enhanced the activity, and the selectivity of long-chain hydrocarbons for CO hydrogenation.
• 中文關鍵字： 硼化鈷; 化學吸附; 一氧化碳氫化; 觸媒
• 英文關鍵字： Cobalt Boride; Chemisorption; Carbon Monoxide; Co Hydrogenation; Catalyst